WhiningKhan
Regular
That is precisely my problem with the scene which I've been going through for the last page or so while you've been boozing.Mmmm…. Bit of a headache but I dont think that’s right. The ‘original’ timeline had Cap going back in time and then 2 min later he was there, old and all. It’s the same timeline. Preeeetty sure.
As explained in the movie, they can't change the history of their own timeline, Back to the Future logic does not work in MCU.
So, just like there is a timeline without Thanos (the one from which he leaped to the final fight of Endgame) and another one with two dead Thanoses (the main timeline of Endgame), there is a timeline with no more Steve Rogers after he exited in the timesuit (the timeline we had been following in MCU where Peggy married someone else) and a timeline which had two caps (one in ice after ww2, the other arriving from the future to woo Peggy). Since we see old Steve sitting there, we are witnessing the latter timeline which is no more the timeline we were looking at earlier. Simple as that.